drm/i915: disable PCH ports if needed when disabling a CRTC
Disable any PCH ports associated with a pipe when disabling it. This should prevent transcoder disable failures due to ports still being on. Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> [ickle: introduce *_PIPE_ENABLED() macro] Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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